/*
    An example showing rainbow colours on a 160x128 TFT LCD screen
    and to show a basic example of font use.

    This example plots the text in a sprite then pushes the sprite to the
    TFT screen.

    Make sure all the display driver and pin comnenctions are correct by
    editting the User_Setup.h file in the TFT_eSPI library folder.

    Note that yield() or delay(0) must be called in long duration for/while
    loops to stop the ESP8266 watchdog triggering.

    #########################################################################
    ###### DON'T FORGET TO UPDATE THE User_Setup.h FILE IN THE LIBRARY ######
    #########################################################################
*/

#define IWIDTH  160
#define IHEIGHT 128

#include <TFT_eSPI.h> // Graphics and font library
#include <SPI.h>

TFT_eSPI tft = TFT_eSPI();  // Invoke library, pins defined in User_Setup.h

TFT_eSprite img = TFT_eSprite(&tft);

unsigned long targetTime = 0;
byte red = 31;
byte green = 0;
byte blue = 0;
byte state = 0;
unsigned int colour = red << 11;

void setup(void) {
    tft.init();
    tft.setRotation(1);
    tft.fillScreen(TFT_BLACK);

    img.createSprite(IWIDTH, IHEIGHT);
    img.fillSprite(TFT_BLACK);

    targetTime = millis() + 1000;
}

void loop() {

    if (targetTime < millis()) {
        targetTime = millis() + 100;//10000;

        // Colour changing state machine
        for (int i = 0; i < 160; i++) {
            img.drawFastVLine(i, 0, img.height(), colour);
            switch (state) {
                case 0:
                    green += 2;
                    if (green == 64) {
                        green = 63;
                        state = 1;
                    }
                    break;
                case 1:
                    red--;
                    if (red == 255) {
                        red = 0;
                        state = 2;
                    }
                    break;
                case 2:
                    blue ++;
                    if (blue == 32) {
                        blue = 31;
                        state = 3;
                    }
                    break;
                case 3:
                    green -= 2;
                    if (green == 255) {
                        green = 0;
                        state = 4;
                    }
                    break;
                case 4:
                    red ++;
                    if (red == 32) {
                        red = 31;
                        state = 5;
                    }
                    break;
                case 5:
                    blue --;
                    if (blue == 255) {
                        blue = 0;
                        state = 0;
                    }
                    break;
            }
            colour = red << 11 | green << 5 | blue;
        }

        // The standard ADAFruit font still works as before
        img.setTextColor(TFT_BLACK);
        img.setCursor(12, 5);
        img.print("Original ADAfruit font!");

        // The new larger fonts do not use the .setCursor call, coords are embedded
        img.setTextColor(TFT_BLACK, TFT_BLACK); // Do not plot the background colour

        // Overlay the black text on top of the rainbow plot (the advantage of not drawing the backgorund colour!)
        img.drawCentreString("Font size 2", 80, 14, 2); // Draw text centre at position 80, 12 using font 2

        //img.drawCentreString("Font size 2",81,12,2); // Draw text centre at position 80, 12 using font 2

        img.drawCentreString("Font size 4", 80, 30, 4); // Draw text centre at position 80, 24 using font 4

        img.drawCentreString("12.34", 80, 54, 6); // Draw text centre at position 80, 24 using font 6

        img.drawCentreString("12.34 is in font size 6", 80, 92, 2); // Draw text centre at position 80, 90 using font 2

        // Note the x position is the top left of the font!

        // draw a floating point number
        float pi = 3.14159; // Value to print
        int precision = 3;  // Number of digits after decimal point
        int xpos = 50;      // x position
        int ypos = 110;     // y position
        int font =
            2;       // font number only 2,4,6,7 valid. Font 6 only contains characters [space] 0 1 2 3 4 5 6 7 8 9 0 : a p m
        xpos += img.drawFloat(pi, precision, xpos, ypos,
                              font); // Draw rounded number and return new xpos delta for next print position
        img.drawString(" is pi", xpos, ypos, font); // Continue printing from new x position

        img.pushSprite(0, 0);
    }
}






